Crypto Tax Rules May Still Miss 86% of Onchain Activity

• Chainalysis estimates at least $457 billion in potentially taxable onchain crypto activity during 2025.
• The United States accounted for $112.6 billion, followed by Germany at $24.1 billion and China at $21 billion.
• Only about 14% of the onchain activity analyzed falls within CARF’s practical reporting reach.
• DeFi, self-custody, P2P transfers and several forms of onchain income remain difficult for tax authorities to reconstruct.

Governments are preparing for the biggest expansion of international crypto tax reporting to date, but the data they receive may still capture only a narrow portion of what actually happens onchain. New research from Chainalysis estimates that potentially taxable onchain crypto activity exceeded $457 billion in 2025, while only about 14% of the activity analyzed would fall within the practical reach of the OECD’s Crypto-Asset Reporting Framework, or CARF.

$457 Billion Is a Lower Boundary, Not a Global Crypto Tax Bill

The headline number requires an important qualification before considering its implications.

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